/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions copyright [year] [name of copyright owner]".
 *
 * Copyright 2014-2015 ForgeRock AS.
 */

package org.forgerock.oauth2.core;

import static org.forgerock.oauth2.core.Utils.*;

import java.net.URI;
import java.net.URISyntaxException;

import org.forgerock.http.MutableUri;
import org.forgerock.oauth2.core.exceptions.InvalidRequestException;
import org.forgerock.oauth2.core.exceptions.RedirectUriMismatchException;

/**
 * Validates that the redirect uri on the request matches against the client's registered redirect uris.
 *
 * @since 12.0.0
 */
public class RedirectUriValidator {

    /**
     * Validates that the requested redirect uri matches against one of the pre-registered redirect uris on the
     * client's registration.
     *
     * @param clientRegistration The client's registration.
     * @param redirectUri The redirect uri.
     * @throws InvalidRequestException If the request is missing any required parameters or is otherwise malformed.
     * @throws RedirectUriMismatchException If the redirect uri on the request does not match the redirect uri
     *          registered for the client.
     */
    public void validate(ClientRegistration clientRegistration, String redirectUri) throws InvalidRequestException,
            RedirectUriMismatchException {

        if (isEmpty(redirectUri)) {
            if (clientRegistration.getRedirectUris().size() == 1) {
                return;
            }

            throw new InvalidRequestException("Missing parameter: redirect_uri");
        }

        MutableUri mutableRequest = null;
        try {
	        mutableRequest = MutableUri.uri(redirectUri);
	        if(mutableRequest.getRawQuery() != null) {
	        	mutableRequest.setQuery(null);
	        }
	        if(mutableRequest.getRawFragment() != null) {
	        	mutableRequest.setRawFragment(null);
	        }
        }catch(URISyntaxException e) {
        	 throw new InvalidRequestException("Invalid parameter: redirect_uri");
        }
        final URI request = mutableRequest.asURI();

        if (request.getFragment() != null) {
            throw new RedirectUriMismatchException();
        }
        if (!request.isAbsolute()) {
            throw new RedirectUriMismatchException();
        }
        for (URI uri : clientRegistration.getRedirectUris()) {
            if (uri.equals(request)) {
                //GOOD CASE
                return;
            }
        }
        throw new RedirectUriMismatchException();
    }
}
